2-Step Random Access Resource Allocation in NR Unlicensed Bands
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Solution Overview
Problem
The existing studies have not adequately addressed the method for radio resource allocation in the Data part of the 2-step random access procedure in NR unlicensed bands, particularly when applying a Block based interlace design, which poses challenges in code multiplexing due to the larger amount of information and increased processing load in the base station.
Innovation Solution
A method for allocating radio resources for the Data part in 2-step random access by determining transmission resources for the Data part based on the resources used for the Preamble part, utilizing a Block based interlace design, which involves associating Preamble numbers with distinct frequency and time resources to enable code-multiplexing and demultiplexing of Preamble and Data parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a Block based interlace design is applied to the Data part in 2-step random access, then frequency-multiplexing and time-multiplexing efficiency is improved, but the processing load in the base station increases
Solution Approach 1:
The patent segments the random access procedure into two distinct parts: the Preamble part (MSG_A) and the Data part (MSG_B). This segmentation allows the base station to process the Preamble part using traditional correlation detection methods, while the Data part is handled through resource determination based on Preamble resource information. This division reduces the overall processing load by separating complex operations into manageable segments with different processing requirements.
Solution Approach 2:
The patent implements preliminary action by having the terminal determine the resources for the Data part (MSG_B) based on the resources used for the Preamble part (MSG_A) before actual transmission. The base station uses the detected Preamble resource information to pre-determine where to find and how to process the corresponding Data part, avoiding the need for complex real-time resource allocation decisions and reducing processing load during peak operation.
2Adaptability or versatility
If additional signaling is used to allocate resources for the Data part, then resource allocation flexibility is improved, but signaling overhead increases
Solution Approach 1:
The patent makes the Preamble resource information serve multiple functions: it identifies the Preamble sequence, determines the time resource for transmission, and simultaneously indicates the resource for the corresponding Data part. This multi-functionality eliminates the need for separate signaling for Data part resource allocation, reducing overhead while maintaining flexibility. The same resource information structure is used for both Preamble and Data part identification.
Solution Approach 2:
The system implements self-service by enabling the terminal to autonomously determine Data part resources based on Preamble resource information without requiring additional base station signaling. The terminal uses the detected Preamble resource parameters (such as time resource index and frequency resource index) to self-determine the corresponding Data part resources, eliminating the need for explicit resource allocation signaling and reducing overall system overhead.
Data Source
AI summary
The present invention provides a terminal that can carry out a random-access process appropriately. A terminal (100) is provided with: a wireless transmission unit (108) that transmits a data signal; and a control unit (101) that determines a second resource for use in transmitting the data signal on the basis of a first resource for use in transmitting a preamble signal.